2018
2018 Specialized Fatboy Comp Carbon
The 2018 Specialized Fatboy Comp Carbon sits more aggressive than most fat bikes, with a steeper head angle and a longer rear center. Reach 395 to 458 mm, stack 602 to 632 mm. The Fatboy Comp Carbon build comes with SRAM GX Eagle shifting and Specialized Ground Control Fat tires.
Source: specialized.com. Checked .
Key facts
- Brand
- Specialized
- Model
- Fatboy
- Model year
- 2018
- Frame
- Comp Carbon
- Type
- Fat
- Geometry labels
- S, M, L, and XL
- Drivetrain
- SRAM GX Eagle
- Geometry
- Complete for every size
- Source
- specialized.com
- Checked
Geometry by size
| Measurement | S | M | L | XL |
|---|---|---|---|---|
| Reach(mm) | 395 | 420 | 437 | 458 |
| Stack(mm) | 602 | 602 | 617 | 632 |
| Head tube angle(°) | 70.5 | 70.5 | 70.5 | 70.5 |
| Seat tube angle(°) | 73 | 73 | 73 | 73 |
| Effective top tube(mm) | 579 | 604 | 626 | 651 |
| Chainstay length(mm) | 455 | 455 | 455 | 455 |
| Wheelbase(mm) | 1088 | 1113 | 1135 | 1161 |
| BB drop(mm) | 60 | 60 | 60 | 60 |
| BB height(mm) | 307 | 307 | 307 | 307 |
| Standover(mm) | 738.5 | 752 | 778.3 | 807.5 |
| Seat tube length(mm) | 394 | 434 | 470 | 520 |
| Fork length(mm) | 496 | 496 | 496 | 496 |
| Head tube length(mm) | 94 | 94 | 110 | 125 |
Stock build
13 parts
Drivetrain
Wheels & Tires
Brakes
SRAM Level TL
Cockpit
Seatpost & Saddle
Keep your Fatboy Comp Carbon in Quiver
Start from this build's stock parts, then record your upgrades. Review it before adding it to your garage.
Free on App StoreFree on Google PlayFree for your first bike, on iPhone and Android.Already have Quiver? Open this build
✓Sources agreeMManufacturer
Quick answers
- Which size or configuration labels have geometry for the 2018 Specialized Fatboy Comp Carbon?
- Geometry is listed for S, M, L, and XL.
- What are the reach and stack of the 2018 Specialized Fatboy Comp Carbon in size L?
- In size L, reach is 437 mm and stack is 617 mm.
- What is the head tube angle of the 2018 Specialized Fatboy Comp Carbon?
- The head tube angle is 70.5 degrees in every size.
- What does the 2018 Specialized Fatboy Comp Carbon ship with?
- The stock build includes SRAM GX Eagle, Specialized Ground Control Fat, SRAM Level TL, and Specialized Stout XC.
- Which years of the Specialized Fatboy are on Quiver?
- Quiver has the Specialized Fatboy for 2018, 2020, 2019, 2017, and 2015.
Know what is on every bike.
Add your bike to Quiver. Keep its parts, setup, and service history together, then share your build.
Explore the app



